Combine Rescue
Member
But still you can try without capacitors.
If MCU is a live it will work without.
If MCU is a live it will work without.
Disconnect battery when doing the test
'Minute' meaning very small or very large resistance?my bad, switch was still on!! There’s a minute resistance through one but nothing through the other but it’s not enough to excite the beep on the multimeter!!
Very small. Should of measured it really but I tested them on the buzzer setting'Minute' meaning very small or very large resistance?
I would expect them to read the same as they are connected in parallel.
Get them snipped off! batteries are a clean enough source that you shouldn't really need them
Like others have suggested the capacitors aren't really critical in this operation as it runs from a battery supply which is pretty stable. So they could be removed with little consequence. Interesting thought on the 8 pin package being EEPROM I did wonder if this was the case or if the IC had internal memory. Can't imagine much is needed to store basic tunes? Seems like there are a few people here knowledgeable on electronics which is grand to see. Especially seeing as agriculture is adopting technology in most applications.
To be fair there are quite a few Youtube videos explaining the circuit components and there uses. The rest I read books for and practical diagnostics on PCB's, remembering that a circuit diagram is a good place to start and learn what each block on the PCB is achieving. The IC (Integrated Circuit) datasheets often give you typical uses and layouts which more often than not the manufacturer of the PCBs has adopted rather than re-invent the wheel so this can help you work out what is going on. I will say without diagrams, complex circuits especially those with Microcontrollers can be time consuming and tricky to fix.Wow!! You guys are good! How/where do you learn this??
I can do a few bits and bobs with electronics but diagnostic stuff on a PCB is usually beyond me.
I regularly change components on my wind turbine rectifier boards but there is no diagnosing required, its the same problem every time.
I will have a look/go but would really like to be a bit better.
Back in my engineering days I knew a test technician whose first approach to any fault was to flex a board one way, then the other & then a sharp rap on the table to test for dry joints. If that didn't work then he had to go back to more conventional approachesA slight update on this. I’ve managed to get it to work!! Unfortunately I’m not 100% sure how. There must be a dry or cracked solder on the board as it came to life while I was testing it and turning it over etc!!
A slight update on this. I’ve managed to get it to work!! Unfortunately I’m not 100% sure how. There must be a dry or cracked solder on the board as it came to life while I was testing it and turning it over etc!!
You should have hit it with a hammer in the beginning!
I'm quite surprised at the number of people on here who are into electronics as well. I'm 11 months off finishing my PhD in Power Electronics. I've been able to get a few things working again round the farm just by being able to solder very small things. Unfortunately, when it's a microcontroller or memory that has failed, there's really nothing you can do because you don't know what was stored in it. Failed capacitors and voltage regulators can usually be replaced though.
Funnily enough, I bought a TIG about this time last year and spent a bit of lockdown trying to get into the swing on mild steel. If there's another lockdown, I'll get started on the aluminium. I'm finding it pretty hard going actually. Far harder than any sort of tiny soldering I've ever done and certainly far harder than the MIG. I think the offcuts of aluminium I picked up to practice on might be contaminated so I might pick up some brand new stuff to give me a better start.The more I look into these things the more I get interested!! It could be a project for this winter, with lockdown 2 looming it’s not looking very good for my other plan over half term to spend a few days on practicing TiG welding Stainless!!!
Funnily enough, I bought a TIG about this time last year and spent a bit of lockdown trying to get into the swing on mild steel. If there's another lockdown, I'll get started on the aluminium. I'm finding it pretty hard going actually. Far harder than any sort of tiny soldering I've ever done and certainly far harder than the MIG. I think the offcuts of aluminium I picked up to practice on might be contaminated so I might pick up some brand new stuff to give me a better start.